A benign (not cancer) condition in which there are more cells than normal in the lining of breast ducts and the cells look abnormal under a microscope. Having atypical ductal hyperplasia increases the risk of breast cancer. Also called ADH and atypical ductal breast hyperplasia.
( AY-TIH-pih-kul DUK-tul HY-per-PLAY-zhuh )
Source: NCI Dictionary of Cancer Terms
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